Run command '/usr/bin/notify-send "hello"' does not work

[xurei]

Environment

• Operating system: Ubuntu 24.10
• Hyperkeys version: 1.3.2

Describe the bug and how to reproduce
This is a follow-up of #50
If I add "Switch audio output", and set it to a shortcut, nothing seems to happen. There is no error in the logs, which means the execution works but the notification does not show up.
This works with a local development build, but apparently the AppImage sandboxes it in some way.

Expected behavior
It should send a notification, even when launched from an AppImage.